Resonance enhanced scanning tunneling (REST) spectroscopy of molecular aggregates on graphite

Möltgen, Holger; Kleinermanns, Karl

doi:10.1039/b301540h

Cited by 1 publication

(2 citation statements)

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“…A similar attempt by Mo ¨ltgen and Kleinermanns to obtain good-resolution STM images of MG on graphite also failed because of the small electrical conductivity of the adsorbate. 22 As the tunneling current perceives the high resistivity of the molecule, the tip approaches further. Thus, we measure a small effective height of 0.2 nm, although an inclined MGITC molecule sticks out approximately 1 nm from the surface.…”

Section: Discussionmentioning

confidence: 99%

“…It was very difficult to obtain STM images from the surfaces covered most densely with MGITC because of the high resistivity of the adsorbate. A similar attempt by Möltgen and Kleinermanns to obtain good-resolution STM images of MG on graphite also failed because of the small electrical conductivity of the adsorbate . As the tunneling current perceives the high resistivity of the molecule, the tip approaches further.…”

Section: Discussionmentioning

confidence: 99%

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Toward Raman Fingerprints of Single Dye Molecules at Atomically Smooth Au(111)

2006

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The creation of a highly enhanced electromagnetic (EM) field underneath a scanning tunneling microscope (STM) tip enables Raman spectroscopic studies of organic submonolayer adsorbates at atomically smooth single crystalline surfaces. To study the sensitivity of this technique, tip-enhanced resonance Raman (TERR) spectra of the dye malachite green isothiocyanate on Au(111) in combination with the corresponding STM images of the probed surface region were analyzed. The detection limit for unambiguous identification of the dye and semiquantitative determination of the surface coverage reaches < or =0.7 pmol/cm(2), or approximately five molecules present in the enhanced-field region, which is confirmed by STM images. Because of well-defined adsorption sites at atomically smooth Au(111) surfaces, no variation in band positions or relative band intensities was observed at the single- or few-molecule detection level when employing TERR spectroscopy.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%